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/*
ChibiOS/GFX - Copyright (C) 2012, 2013
Joel Bodenmann aka Tectu <joel@unormal.org>
This file is part of ChibiOS/GFX.
ChibiOS/GFX is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/GFX is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file src/gdisp/image_native.c
* @brief GDISP native image code.
*/
#include "ch.h"
#include "hal.h"
#include "gfx.h"
#if GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_NATIVE
/**
* How big a pixel array to allocate for blitting
* Bigger is faster but uses more RAM.
*/
#define BLIT_BUFFER_SIZE 32
#define HEADER_SIZE 8
#define FRAME0POS (HEADER_SIZE)
typedef struct gdispImagePrivate {
pixel_t *frame0cache;
pixel_t buf[BLIT_BUFFER_SIZE];
} gdispImagePrivate;
gdispImageError gdispImageOpen_NATIVE(gdispImage *img) {
uint8_t hdr[HEADER_SIZE];
/* Read the 8 byte header */
if (img->io.fns->read(&img->io, hdr, 8) != 8)
return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us
if (hdr[0] != 'N' || hdr[1] != 'I')
return GDISP_IMAGE_ERR_BADFORMAT; // It can't be us
if (hdr[6] != GDISP_PIXELFORMAT/256 || hdr[7] != (GDISP_PIXELFORMAT & 0xFF))
return GDISP_IMAGE_ERR_UNSUPPORTED; // Unsupported pixel format
/* We know we are a native format image */
img->flags = 0;
img->width = (((uint16_t)hdr[2])<<8) | (hdr[3]);
img->height = (((uint16_t)hdr[4])<<8) | (hdr[5]);
if (img->width < 1 || img->height < 1)
return GDISP_IMAGE_ERR_BADDATA;
if (!(img->priv = (gdispImagePrivate *)chHeapAlloc(NULL, sizeof(gdispImagePrivate))))
return GDISP_IMAGE_ERR_NOMEMORY;
img->membytes = sizeof(gdispImagePrivate);
img->priv->frame0cache = 0;
return GDISP_IMAGE_ERR_OK;
}
void gdispImageClose_NATIVE(gdispImage *img) {
if (img->priv) {
if (img->priv->frame0cache)
chHeapFree((void *)img->priv->frame0cache);
chHeapFree((void *)img->priv);
img->priv = 0;
}
img->membytes = 0;
img->io.fns->close(&img->io);
}
gdispImageError gdispImageCache_NATIVE(gdispImage *img) {
size_t len;
/* If we are already cached - just return OK */
if (img->priv->frame0cache)
return GDISP_IMAGE_ERR_OK;
/* We need to allocate the cache */
len = img->width * img->height * sizeof(pixel_t);
img->priv->frame0cache = (pixel_t *)chHeapAlloc(NULL, len);
if (!img->priv->frame0cache)
return GDISP_IMAGE_ERR_NOMEMORY;
img->membytes += len;
/* Read the entire bitmap into cache */
img->io.fns->seek(&img->io, FRAME0POS);
if (img->io.fns->read(&img->io, img->priv->frame0cache, len) != len)
return GDISP_IMAGE_ERR_BADDATA;
return GDISP_IMAGE_ERR_OK;
}
gdispImageError gdispImageDraw_NATIVE(gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy) {
coord_t mx, mcx;
size_t pos, len;
/* Check some reasonableness */
if (sx >= img->width || sy >= img->height) return GDISP_IMAGE_ERR_OK;
if (sx + cx > img->width) cx = img->width - sx;
if (sy + cy > img->height) cy = img->height - sy;
/* Draw from the image cache - if it exists */
if (img->priv->frame0cache) {
gdispBlitAreaEx(x, y, cx, cy, sx, sy, img->width, img->priv->frame0cache);
return GDISP_IMAGE_ERR_OK;
}
/* For this image decoder we cheat and just seek straight to the region we want to display */
pos = FRAME0POS + (img->width * sy + cx) * sizeof(pixel_t);
/* Cycle through the lines */
for(;cy;cy--, y++) {
/* Move to the start of the line */
img->io.fns->seek(&img->io, pos);
/* Draw the line in chunks using BitBlt */
for(mx = x, mcx = cx; mcx > 0; mcx -= len, mx += len) {
// Read the data
len = img->io.fns->read(&img->io,
img->priv->buf,
mx > BLIT_BUFFER_SIZE ? (BLIT_BUFFER_SIZE*sizeof(pixel_t)) : (mx * sizeof(pixel_t)))
/ sizeof(pixel_t);
if (!len)
return GDISP_IMAGE_ERR_BADDATA;
/* Blit the chunk of data */
gdispBlitAreaEx(mx, y, len, 1, 0, 0, len, img->priv->buf);
}
/* Get the position for the start of the next line */
pos += img->width*sizeof(pixel_t);
}
return GDISP_IMAGE_ERR_OK;
}
systime_t gdispImageNext_NATIVE(gdispImage *img) {
(void) img;
/* No more frames/pages */
return TIME_INFINITE;
}
#endif /* GFX_USE_GDISP && GDISP_NEED_IMAGE && GDISP_NEED_IMAGE_NATIVE */
/** @} */
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